Well, they could conceivably cancel if there was civil unrest in an area, or maybe a hurricane was slated to hit, or things of that nature that might pose a danger to you. I cannot remember if the Peru trip last month got cancelled because of road collapses near Macchu Pichu, but that's the only trip I've heard of even possibly being cancelled due to any reason other than lack of people.
Last year, some trips only had 2 or 3 people signed up, so that was why trips got cancelled & consolidated. I've been on 1 trip that went with 14 people, and another that went with 15, and I know others who have gone on trips with small numbers, so it's not like they're going to cancel just because 40 people didn't sign up. I really think
ABD was between a rock & a hard place last year, due to the economy.
They've also instituted a new policy this year that they will not cancel any trip less than 85 days before it goes, so at least you'd have 3 month's warning. I have to admit; it's one of the downsides of ABD. But their trips are just so fabulous, it seems to be worth the risk...
Sayhello